2011 The Founding of Kanem by Assyrian Refugees ca. 600 BCE: Documentary, Linguistic, and Archaeological Evidence, Boston, Working Papers in African Studies° 265, 44 p.


-  "Abwanderung der assyrischen tamkaru nach Nubien, Darfur und ins Tschadseegebiet'" , in: B. Nowak et al. eds., Miscellanea Tymowski, Warsaw, 2011, 199-226.


2009 "An Assyrian successor state in West Africa : the ancestral kings of Kebbi as ancient Near Eastern rulers ", Anthropos, 104, 2 (2009), 359-382. 


- "Biblical patriarchs from a pre-canonical source mentioned in the Diwan of Kanem-Bornu (Lake Chad region) ", Zeitschrift für Alttestamentliche Wissenschaft 121, 4 (2009), 588-597. 


2006 "The Mune as the Ark of the Covenant between Duguwa and Sefuwa [in ancient Kanem]", Borno Museum Society Newsletter 66-67 (2006), 15-25. (The article has a map of the ancient Central Sahara and proposes to identify Agisymba of 100 CE with the early Kanem state). 


2004a "West Africa and the classical world - neglected contexts", in H. Bley et al. Afrika im Kontext, 19th International biennial conference of the African Studies Associations in Germany, July 2-5, Hannover, Historical Seminar, CD-Rom, 20 p.

2004b  "Spread of the Canaanite state to West Africa", in: D. Lange, Ancient Kingdoms, 277-287. 

1977 with Silvio Berthoud, "Al-Qasaba et d'autres villes de la route centrale du Sahara", Paideuma 23, 181-200.  Reprinted in: D. Lange, Ancient Kingdoms, 13-34;  comments,  545-547). 

1981 "Un document_de_la_fin_du_XVIIe sìècle sur le commerce transsaharien", in: J. Devisse (ed.), Le sol, la parole et l'écrit. Mélanges en hommage à Raymond Mauny, Paris, 673-684.

2005 "The Phoenician slave trade and the rise of states in the Central Sudan", in: François-Xavier Fauvelle-Aymar et Bertrand Hirsch (eds.), Mélanges Jean Boulègue (in press).

1991 (with R. Baumhauer) "Der Alaun des Kawar (Niger): Vorkommen und Abbau", Paideuma 37, 223-231. 

1984 "Notes sur le Kawar au Moyen-Age", Mu Kara Sani (Niamey) 3, 1, 12-18 (reprinted in Lange, Ancient Kingdoms, 43-47; comments,  547-8).

1983 "L'alun du Kawar: une exportation africaine vers l'Europe", Cahiers du Centre de Recherches Africaines 2, 21-4 (reprinted in Lange, Ancient Kingdoms, 35-41; comments, 547).

1981 "Un document de la fin du XVIIe siècle sur le commerce transsaharien": J. Devisse (ed.), Le sol, la parole et l'écrit. Mélanges en hommage à Raymond Mauny, Paris, vol. II, 673-84.

Trans-Saharan contacts are also studied in the following publications:

2005a "Zwischen Wüste und Regenwald - die Großreiche der westlichen Sudanzone", H. Hogen (ed.), ZEIT-Weltgeschichte (in press).

1995b "Links between West Africa and the Ancient Orient", in: H. Willer et al. (eds.), Macht der Identität - Identität der Macht, Münster, 347-369 (reprinted in Lange, Ancient Kingdoms, 319-341; comments, 560-1).
1987 "The Chad region as a crossroads", in: M. al-Fasi (ed.), General History of Africa (UNESCO), vol. III, 436-460.

1986 "Society in the Lake Chad area at the end of the Byzantine period, prior to the introduction of Islam", Libya Antiqua (The General History of Africa, UNESCO: Studies and Documents, 11) Paris, 235-42.

1984 "The kingdoms and peoples of Chad", in: D. T. Niane (ed.), General History of Africa, (UNESCO), vol. IV, Paris, 238-265.

1978 "Progrès de l'Islam et changements politiques au K1nem du XIe au XIIIe siècle: un essai d'interprétation", Journal of African History 19 (4), 495-513 (reprinted in Lange, Ancient Kingdoms, 49-67; comments, 549-550).